E. LONG-ANSWER QUESTIONS: Answer these questions.
1. What are the main points of the cell theory of life?
2. What are the functions of the following in a cell?
a cell membrand
b) cytoplasm
c. nucleus
d. chromosomes
e mitochondria f. vacuoles
3. With the help of examples, show the variation in shapes and sizes of cells.
Answers
Ans:- The main points of the cell theory of life are:-
1. The cell is the smallest and fundamental unit of life.
2. All living things are made from one or more than one cell.
3. All cells are too small that it couldn't be visible by our naked eye.
4. Cells perform some basic function like respiration, growth, etc.
5. All cells arises from pre-existing cells.
2. Function of cell membrane:-
a. It control the entry and exit of the substance that enters the cell.
b. It protects the cell from its surroundings.
c. It is also known as selectively permeable membrane.
Function of cytoplasm:-
a. It enables cells to preserve their Turgidity(help to maintain their shape).
b. It holds the content of the cell like useful enzyme, nutrients,etc.
Function of nucleus:-
a. It control cell division and cell growth.
b. It is responsible for inherent of genes from one generation to other.
c. It plays central role in cellular reproduction.
Function of chromosome:-
a. It regulates the protein of cell.
b. It determine the gender of an individual.
Function of mitochondria:-
a. It helps in the production of energy for cell.
b. It also helps in cellular respiration.
c. It is also known as powerhouse of the cell.
d. It also helps in detoxifying ammonia from liver.
Function of vacuoles:-
a. It provide rigidity in plant cell.
b. It acts as a storage sacks of cell and stores food, water, etc.
c. It also stores waste material of the cell.
3. cells also differs in shape and size because of following reasons:-
a. To perform specific function in an organism the shape and size of cell gets differ in an organism.
b. Ex- The cheek cell is smaller than a nerve cell.
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